On some boards card power is hard wired to the slot
and active regardless of host controller state.
When runtime PM suspends such a host, certain cards
may keep their current configuration (e.g. bus width),
now when runtime PM resumes the host, communication
with the card will fail.
This was observed on AP4EVB with tmio_mmc and a b43 based
SDIO card:
http://marc.info/?l=linux-mmc&m=128854536521274&w=2
This patch, fixes the problem by resetting the SDIO
card on power restore.
Signed-off-by: Arnd Hannemann <a...@arndnet.de>
---
drivers/mmc/core/core.c | 7 ++++++-
1 files changed, 6 insertions(+), 1 deletions(-)
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 31ae07a..21cdee6 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -1617,8 +1617,13 @@ int mmc_power_restore_host(struct mmc_host *host)
}
mmc_power_up(host);
- ret = host->bus_ops->power_restore(host);
+ mmc_claim_host(host);
+ sdio_reset(host);
+ mmc_go_idle(host);
+ mmc_release_host(host);
+
+ ret = host->bus_ops->power_restore(host);
mmc_bus_put(host);
return ret;
--
1.7.2.3
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